I have driven BMW's for 18 years, the ride and handling are great This particular model X3 3.5 is far too computerized for most BMW shops to handle to the point of it being a servicing nightmare.
Personally, I find the limited storage space a real problem. No place for sunglasses or cell phone except in centre consol compartment. Limited charging outlets (one) limited usb outlets (one).
I think most reviews for this vehicle on this site are either from dealers or people that have less than 30,000 on the vehicle.

Purchased SUV new. has had numerous electrical issues. Both front wheel bearings (L&R) failed at 83k dealer helped cost out of warranty, then $1000 engine fan failed at 90k ... overall disappointing quality of components. Would not recommend if you want reliability.